// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function (mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
    else // Plain browser env
        mod(CodeMirror);
})(function (CodeMirror) {
    "use strict";

    CodeMirror.defineMode("javascript", function (config, parserConfig) {
        var indentUnit = config.indentUnit;
        var statementIndent = parserConfig.statementIndent;
        var jsonldMode = parserConfig.jsonld;
        var jsonMode = parserConfig.json || jsonldMode;
        var isTS = parserConfig.typescript;
        var wordRE = parserConfig.wordCharacters || /[\w$\xa1-\uffff]/;

        // Tokenizer

        var keywords = function () {
            function kw(type) {
                return {type: type, style: "keyword"};
            }

            var A = kw("keyword a"), B = kw("keyword b"), C = kw("keyword c"), D = kw("keyword d");
            var operator = kw("operator"), atom = {type: "atom", style: "atom"};

            return {
                "if": kw("if"),
                "while": A,
                "with": A,
                "else": B,
                "do": B,
                "try": B,
                "finally": B,
                "return": D,
                "break": D,
                "continue": D,
                "new": kw("new"),
                "void": C,
                "throw": C,
                "debugger": kw("debugger"),
                "var": kw("var"),
                "const": kw("var"),
                "let": kw("var"),
                "require": kw("var"),
                "include": kw("var"),
                "water": kw("var"),
                "rock": kw("var"),
                "log": kw("function"),
                "context": kw("var"),
                "function": kw("function"),
                "catch": kw("catch"),
                "for": kw("for"),
                "switch": kw("switch"),
                "case": kw("case"),
                "default": kw("default"),
                "in": operator,
                "typeof": operator,
                "instanceof": operator,
                "true": atom,
                "false": atom,
                "null": atom,
                "undefined": atom,
                "NaN": atom,
                "Infinity": atom,
                "alter": atom,
                "and": atom,
                "as": atom,
                "asc": atom,
                "between": atom,
                "by": atom,
                "count": atom,
                "create": atom,
                "delete": atom,
                "desc": atom,
                "distinct": atom,
                "drop": atom,
                "from": atom,
                "group": atom,
                "having": atom,
                "insert": atom,
                "into": atom,
                "is": atom,
                "join": atom,
                "left": atom,
                "right": atom,
                "inner": atom,
                "like": atom,
                "not": atom,
                "on": atom,
                "or": atom,
                "order": atom,
                "select": atom,
                "set": atom,
                "table": atom,
                "union": atom,
                "update": atom,
                "values": atom,
                "where": atom,
                "limit": atom,
                "truncate": atom,
                "ALTER": atom,
                "AND": atom,
                "AS": atom,
                "ASC": atom,
                "BETWEEN": atom,
                "BY": atom,
                "COUNT": atom,
                "CREATE": atom,
                "DELETE": atom,
                "DESC": atom,
                "DISTINCT": atom,
                "DROP": atom,
                "FROM": atom,
                "GROUP": atom,
                "HAVING": atom,
                "IN": atom,
                "INSERT": atom,
                "INTO": atom,
                "IS": atom,
                "JOIN": atom,
                "LEFT": atom,
                "RIGHT": atom,
                "INNER": atom,
                "LIKE": atom,
                "NOT": atom,
                "ON": atom,
                "OR": atom,
                "ORDER": atom,
                "SELECT": atom,
                "SET": atom,
                "TABLE": atom,
                "UNION": atom,
                "UPDATE": atom,
                "VALUES": atom,
                "WHERE": atom,
                "LIMIT": atom,
                "TRUNCATE": atom,
                "this": kw("this"),
                "class": kw("class"),
                "super": kw("atom"),
                "yield": C,
                "export": kw("export"),
                "import": kw("import"),
                "extends": C,
                "await": C
            };
        }();

        var isOperatorChar = /[+\-*&%=<>!?|~^@]/;
        var isJsonldKeyword = /^@(context|id|value|language|type|container|list|set|reverse|index|base|vocab|graph)"/;

        function readRegexp(stream) {
            var escaped = false, next, inSet = false;
            while ((next = stream.next()) != null) {
                if (!escaped) {
                    if (next == "/" && !inSet) return;
                    if (next == "[") inSet = true;
                    else if (inSet && next == "]") inSet = false;
                }
                escaped = !escaped && next == "\\";
            }
        }

        // Used as scratch variables to communicate multiple values without
        // consing up tons of objects.
        var type, content;

        function ret(tp, style, cont) {
            type = tp;
            content = cont;
            return style;
        }

        function tokenBase(stream, state) {
            var ch = stream.next();
            if (ch == '"' || ch == "'") {
                state.tokenize = tokenString(ch);
                return state.tokenize(stream, state);
            } else if (ch == "." && stream.match(/^\d+(?:[eE][+\-]?\d+)?/)) {
                return ret("number", "number");
            } else if (ch == "." && stream.match("..")) {
                return ret("spread", "meta");
            } else if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
                return ret(ch);
            } else if (ch == "=" && stream.eat(">")) {
                return ret("=>", "operator");
            } else if (ch == "0" && stream.eat(/x/i)) {
                stream.eatWhile(/[\da-f]/i);
                return ret("number", "number");
            } else if (ch == "0" && stream.eat(/o/i)) {
                stream.eatWhile(/[0-7]/i);
                return ret("number", "number");
            } else if (ch == "0" && stream.eat(/b/i)) {
                stream.eatWhile(/[01]/i);
                return ret("number", "number");
            } else if (/\d/.test(ch)) {
                stream.match(/^\d*(?:\.\d*)?(?:[eE][+\-]?\d+)?/);
                return ret("number", "number");
            } else if (ch == "/") {
                if (stream.eat("*")) {
                    state.tokenize = tokenComment;
                    return tokenComment(stream, state);
                } else if (stream.eat("/")) {
                    stream.skipToEnd();
                    return ret("comment", "comment");
                } else if (expressionAllowed(stream, state, 1)) {
                    readRegexp(stream);
                    stream.match(/^\b(([gimyu])(?![gimyu]*\2))+\b/);
                    return ret("regexp", "string-2");
                } else {
                    stream.eat("=");
                    return ret("operator", "operator", stream.current());
                }
            } else if (ch == "`") {
                state.tokenize = tokenQuasi;
                return tokenQuasi(stream, state);
            } else if (ch == "#") {
                stream.skipToEnd();
                return ret("error", "error");
            } else if (isOperatorChar.test(ch)) {
                if (ch != ">" || !state.lexical || state.lexical.type != ">") {
                    if (stream.eat("=")) {
                        if (ch == "!" || ch == "=") stream.eat("=")
                    } else if (/[<>*+\-]/.test(ch)) {
                        stream.eat(ch)
                        if (ch == ">") stream.eat(ch)
                    }
                }
                return ret("operator", "operator", stream.current());
            } else if (wordRE.test(ch)) {
                stream.eatWhile(wordRE);
                var word = stream.current()
                if (state.lastType != ".") {
                    if (keywords.propertyIsEnumerable(word)) {
                        var kw = keywords[word]
                        return ret(kw.type, kw.style, word)
                    }
                    if (word == "async" && stream.match(/^(\s|\/\*.*?\*\/)*[\(\w]/, false))
                        return ret("async", "keyword", word)
                }
                return ret("variable", "variable", word)
            }
        }

        function tokenString(quote) {
            return function (stream, state) {
                var escaped = false, next;
                if (jsonldMode && stream.peek() == "@" && stream.match(isJsonldKeyword)) {
                    state.tokenize = tokenBase;
                    return ret("jsonld-keyword", "meta");
                }
                while ((next = stream.next()) != null) {
                    if (next == quote && !escaped) break;
                    escaped = !escaped && next == "\\";
                }
                if (!escaped) state.tokenize = tokenBase;
                return ret("string", "string");
            };
        }

        function tokenComment(stream, state) {
            var maybeEnd = false, ch;
            while (ch = stream.next()) {
                if (ch == "/" && maybeEnd) {
                    state.tokenize = tokenBase;
                    break;
                }
                maybeEnd = (ch == "*");
            }
            return ret("comment", "comment");
        }

        function tokenQuasi(stream, state) {
            var escaped = false, next;
            while ((next = stream.next()) != null) {
                if (!escaped && (next == "`" || next == "$" && stream.eat("{"))) {
                    state.tokenize = tokenBase;
                    break;
                }
                escaped = !escaped && next == "\\";
            }
            return ret("quasi", "string-2", stream.current());
        }

        var brackets = "<([{}])>";
        // This is a crude lookahead trick to try and notice that we're
        // parsing the argument patterns for a fat-arrow function before we
        // actually hit the arrow token. It only works if the arrow is on
        // the same line as the arguments and there's no strange noise
        // (comments) in between. Fallback is to only notice when we hit the
        // arrow, and not declare the arguments as locals for the arrow
        // body.
        function findFatArrow(stream, state) {
            if (state.fatArrowAt) state.fatArrowAt = null;
            var arrow = stream.string.indexOf("=>", stream.start);
            if (arrow < 0) return;

            if (isTS) { // Try to skip TypeScript return type declarations after the arguments
                var m = /:\s*(?:\w+(?:<[^>]*>|\[\])?|\{[^}]*\})\s*$/.exec(stream.string.slice(stream.start, arrow))
                if (m) arrow = m.index
            }

            var depth = 0, sawSomething = false;
            for (var pos = arrow - 1; pos >= 0; --pos) {
                var ch = stream.string.charAt(pos);
                var bracket = brackets.indexOf(ch);
                if (bracket >= 0 && bracket < 3) {
                    if (!depth) {
                        ++pos;
                        break;
                    }
                    if (--depth == 0) {
                        if (ch == "(") sawSomething = true;
                        break;
                    }
                } else if (bracket >= 3 && bracket < 6) {
                    ++depth;
                } else if (wordRE.test(ch)) {
                    sawSomething = true;
                } else if (/["'\/]/.test(ch)) {
                    return;
                } else if (sawSomething && !depth) {
                    ++pos;
                    break;
                }
            }
            if (sawSomething && !depth) state.fatArrowAt = pos;
        }

        // Parser

        var atomicTypes = {
            "atom": true,
            "number": true,
            "variable": true,
            "string": true,
            "regexp": true,
            "this": true,
            "jsonld-keyword": true
        };

        function JSLexical(indented, column, type, align, prev, info) {
            this.indented = indented;
            this.column = column;
            this.type = type;
            this.prev = prev;
            this.info = info;
            if (align != null) this.align = align;
        }

        function inScope(state, varname) {
            for (var v = state.localVars; v; v = v.next)
                if (v.name == varname) return true;
            for (var cx = state.context; cx; cx = cx.prev) {
                for (var v = cx.vars; v; v = v.next)
                    if (v.name == varname) return true;
            }
        }

        function parseJS(state, style, type, content, stream) {
            var cc = state.cc;
            // Communicate our context to the combinators.
            // (Less wasteful than consing up a hundred closures on every call.)
            cx.state = state;
            cx.stream = stream;
            cx.marked = null, cx.cc = cc;
            cx.style = style;

            if (!state.lexical.hasOwnProperty("align"))
                state.lexical.align = true;

            while (true) {
                var combinator = cc.length ? cc.pop() : jsonMode ? expression : statement;
                if (combinator(type, content)) {
                    while (cc.length && cc[cc.length - 1].lex)
                        cc.pop()();
                    if (cx.marked) return cx.marked;
                    if (type == "variable" && inScope(state, content)) return "variable-2";
                    return style;
                }
            }
        }

        // Combinator utils

        var cx = {state: null, column: null, marked: null, cc: null};

        function pass() {
            for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
        }

        function cont() {
            pass.apply(null, arguments);
            return true;
        }

        function register(varname) {
            function inList(list) {
                for (var v = list; v; v = v.next)
                    if (v.name == varname) return true;
                return false;
            }

            var state = cx.state;
            cx.marked = "def";
            if (state.context) {
                if (inList(state.localVars)) return;
                state.localVars = {name: varname, next: state.localVars};
            } else {
                if (inList(state.globalVars)) return;
                if (parserConfig.globalVars)
                    state.globalVars = {name: varname, next: state.globalVars};
            }
        }

        function isModifier(name) {
            return name == "public" || name == "private" || name == "protected" || name == "abstract" || name == "readonly"
        }

        // Combinators

        var defaultVars = {name: "this", next: {name: "arguments"}};

        function pushcontext() {
            cx.state.context = {prev: cx.state.context, vars: cx.state.localVars};
            cx.state.localVars = defaultVars;
        }

        function popcontext() {
            cx.state.localVars = cx.state.context.vars;
            cx.state.context = cx.state.context.prev;
        }

        function pushlex(type, info) {
            var result = function () {
                var state = cx.state, indent = state.indented;
                if (state.lexical.type == "stat") indent = state.lexical.indented;
                else for (var outer = state.lexical; outer && outer.type == ")" && outer.align; outer = outer.prev)
                    indent = outer.indented;
                state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
            };
            result.lex = true;
            return result;
        }

        function poplex() {
            var state = cx.state;
            if (state.lexical.prev) {
                if (state.lexical.type == ")")
                    state.indented = state.lexical.indented;
                state.lexical = state.lexical.prev;
            }
        }

        poplex.lex = true;

        function expect(wanted) {
            function exp(type) {
                if (type == wanted) return cont();
                else if (wanted == ";") return pass();
                else return cont(exp);
            };
            return exp;
        }

        function statement(type, value) {
            if (type == "var") return cont(pushlex("vardef", value.length), vardef, expect(";"), poplex);
            if (type == "keyword a") return cont(pushlex("form"), parenExpr, statement, poplex);
            if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
            if (type == "keyword d") return cx.stream.match(/^\s*$/, false) ? cont() : cont(pushlex("stat"), maybeexpression, expect(";"), poplex);
            if (type == "debugger") return cont(expect(";"));
            if (type == "{") return cont(pushlex("}"), block, poplex);
            if (type == ";") return cont();
            if (type == "if") {
                if (cx.state.lexical.info == "else" && cx.state.cc[cx.state.cc.length - 1] == poplex)
                    cx.state.cc.pop()();
                return cont(pushlex("form"), parenExpr, statement, poplex, maybeelse);
            }
            if (type == "function") return cont(functiondef);
            if (type == "for") return cont(pushlex("form"), forspec, statement, poplex);
            if (type == "class" || (isTS && value == "interface")) {
                cx.marked = "keyword";
                return cont(pushlex("form"), className, poplex);
            }
            if (type == "variable") {
                if (isTS && value == "type") {
                    cx.marked = "keyword"
                    return cont(typeexpr, expect("operator"), typeexpr, expect(";"));
                } else if (isTS && value == "declare") {
                    cx.marked = "keyword"
                    return cont(statement)
                } else if (isTS && (value == "module" || value == "enum") && cx.stream.match(/^\s*\w/, false)) {
                    cx.marked = "keyword"
                    return cont(pushlex("form"), pattern, expect("{"), pushlex("}"), block, poplex, poplex)
                } else if (isTS && value == "namespace") {
                    cx.marked = "keyword"
                    return cont(pushlex("form"), expression, block, poplex)
                } else {
                    return cont(pushlex("stat"), maybelabel);
                }
            }
            if (type == "switch") return cont(pushlex("form"), parenExpr, expect("{"), pushlex("}", "switch"),
                block, poplex, poplex);
            if (type == "case") return cont(expression, expect(":"));
            if (type == "default") return cont(expect(":"));
            if (type == "catch") return cont(pushlex("form"), pushcontext, expect("("), funarg, expect(")"),
                statement, poplex, popcontext);
            if (type == "export") return cont(pushlex("stat"), afterExport, poplex);
            if (type == "import") return cont(pushlex("stat"), afterImport, poplex);
            if (type == "async") return cont(statement)
            if (value == "@") return cont(expression, statement)
            return pass(pushlex("stat"), expression, expect(";"), poplex);
        }

        function expression(type, value) {
            return expressionInner(type, value, false);
        }

        function expressionNoComma(type, value) {
            return expressionInner(type, value, true);
        }

        function parenExpr(type) {
            if (type != "(") return pass()
            return cont(pushlex(")"), expression, expect(")"), poplex)
        }

        function expressionInner(type, value, noComma) {
            if (cx.state.fatArrowAt == cx.stream.start) {
                var body = noComma ? arrowBodyNoComma : arrowBody;
                if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, expect("=>"), body, popcontext);
                else if (type == "variable") return pass(pushcontext, pattern, expect("=>"), body, popcontext);
            }

            var maybeop = noComma ? maybeoperatorNoComma : maybeoperatorComma;
            if (atomicTypes.hasOwnProperty(type)) return cont(maybeop);
            if (type == "function") return cont(functiondef, maybeop);
            if (type == "class" || (isTS && value == "interface")) {
                cx.marked = "keyword";
                return cont(pushlex("form"), classExpression, poplex);
            }
            if (type == "keyword c" || type == "async") return cont(noComma ? expressionNoComma : expression);
            if (type == "(") return cont(pushlex(")"), maybeexpression, expect(")"), poplex, maybeop);
            if (type == "operator" || type == "spread") return cont(noComma ? expressionNoComma : expression);
            if (type == "[") return cont(pushlex("]"), arrayLiteral, poplex, maybeop);
            if (type == "{") return contCommasep(objprop, "}", null, maybeop);
            if (type == "quasi") return pass(quasi, maybeop);
            if (type == "new") return cont(maybeTarget(noComma));
            return cont();
        }

        function maybeexpression(type) {
            if (type.match(/[;\}\)\],]/)) return pass();
            return pass(expression);
        }

        function maybeoperatorComma(type, value) {
            if (type == ",") return cont(expression);
            return maybeoperatorNoComma(type, value, false);
        }

        function maybeoperatorNoComma(type, value, noComma) {
            var me = noComma == false ? maybeoperatorComma : maybeoperatorNoComma;
            var expr = noComma == false ? expression : expressionNoComma;
            if (type == "=>") return cont(pushcontext, noComma ? arrowBodyNoComma : arrowBody, popcontext);
            if (type == "operator") {
                if (/\+\+|--/.test(value) || isTS && value == "!") return cont(me);
                if (isTS && value == "<" && cx.stream.match(/^([^>]|<.*?>)*>\s*\(/, false))
                    return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, me);
                if (value == "?") return cont(expression, expect(":"), expr);
                return cont(expr);
            }
            if (type == "quasi") {
                return pass(quasi, me);
            }
            if (type == ";") return;
            if (type == "(") return contCommasep(expressionNoComma, ")", "call", me);
            if (type == ".") return cont(property, me);
            if (type == "[") return cont(pushlex("]"), maybeexpression, expect("]"), poplex, me);
            if (isTS && value == "as") {
                cx.marked = "keyword";
                return cont(typeexpr, me)
            }
            if (type == "regexp") {
                cx.state.lastType = cx.marked = "operator"
                cx.stream.backUp(cx.stream.pos - cx.stream.start - 1)
                return cont(expr)
            }
        }

        function quasi(type, value) {
            if (type != "quasi") return pass();
            if (value.slice(value.length - 2) != "${") return cont(quasi);
            return cont(expression, continueQuasi);
        }

        function continueQuasi(type) {
            if (type == "}") {
                cx.marked = "string-2";
                cx.state.tokenize = tokenQuasi;
                return cont(quasi);
            }
        }

        function arrowBody(type) {
            findFatArrow(cx.stream, cx.state);
            return pass(type == "{" ? statement : expression);
        }

        function arrowBodyNoComma(type) {
            findFatArrow(cx.stream, cx.state);
            return pass(type == "{" ? statement : expressionNoComma);
        }

        function maybeTarget(noComma) {
            return function (type) {
                if (type == ".") return cont(noComma ? targetNoComma : target);
                else if (type == "variable" && isTS) return cont(maybeTypeArgs, noComma ? maybeoperatorNoComma : maybeoperatorComma)
                else return pass(noComma ? expressionNoComma : expression);
            };
        }

        function target(_, value) {
            if (value == "target") {
                cx.marked = "keyword";
                return cont(maybeoperatorComma);
            }
        }

        function targetNoComma(_, value) {
            if (value == "target") {
                cx.marked = "keyword";
                return cont(maybeoperatorNoComma);
            }
        }

        function maybelabel(type) {
            if (type == ":") return cont(poplex, statement);
            return pass(maybeoperatorComma, expect(";"), poplex);
        }

        function property(type) {
            if (type == "variable") {
                cx.marked = "property";
                return cont();
            }
        }

        function objprop(type, value) {
            if (type == "async") {
                cx.marked = "property";
                return cont(objprop);
            } else if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property";
                if (value == "get" || value == "set") return cont(getterSetter);
                var m // Work around fat-arrow-detection complication for detecting typescript typed arrow params
                if (isTS && cx.state.fatArrowAt == cx.stream.start && (m = cx.stream.match(/^\s*:\s*/, false)))
                    cx.state.fatArrowAt = cx.stream.pos + m[0].length
                return cont(afterprop);
            } else if (type == "number" || type == "string") {
                cx.marked = jsonldMode ? "property" : (cx.style + " property");
                return cont(afterprop);
            } else if (type == "jsonld-keyword") {
                return cont(afterprop);
            } else if (isTS && isModifier(value)) {
                cx.marked = "keyword"
                return cont(objprop)
            } else if (type == "[") {
                return cont(expression, maybetype, expect("]"), afterprop);
            } else if (type == "spread") {
                return cont(expressionNoComma, afterprop);
            } else if (value == "*") {
                cx.marked = "keyword";
                return cont(objprop);
            } else if (type == ":") {
                return pass(afterprop)
            }
        }

        function getterSetter(type) {
            if (type != "variable") return pass(afterprop);
            cx.marked = "property";
            return cont(functiondef);
        }

        function afterprop(type) {
            if (type == ":") return cont(expressionNoComma);
            if (type == "(") return pass(functiondef);
        }

        function commasep(what, end, sep) {
            function proceed(type, value) {
                if (sep ? sep.indexOf(type) > -1 : type == ",") {
                    var lex = cx.state.lexical;
                    if (lex.info == "call") lex.pos = (lex.pos || 0) + 1;
                    return cont(function (type, value) {
                        if (type == end || value == end) return pass()
                        return pass(what)
                    }, proceed);
                }
                if (type == end || value == end) return cont();
                return cont(expect(end));
            }

            return function (type, value) {
                if (type == end || value == end) return cont();
                return pass(what, proceed);
            };
        }

        function contCommasep(what, end, info) {
            for (var i = 3; i < arguments.length; i++)
                cx.cc.push(arguments[i]);
            return cont(pushlex(end, info), commasep(what, end), poplex);
        }

        function block(type) {
            if (type == "}") return cont();
            return pass(statement, block);
        }

        function maybetype(type, value) {
            if (isTS) {
                if (type == ":") return cont(typeexpr);
                if (value == "?") return cont(maybetype);
            }
        }

        function mayberettype(type) {
            if (isTS && type == ":") {
                if (cx.stream.match(/^\s*\w+\s+is\b/, false)) return cont(expression, isKW, typeexpr)
                else return cont(typeexpr)
            }
        }

        function isKW(_, value) {
            if (value == "is") {
                cx.marked = "keyword"
                return cont()
            }
        }

        function typeexpr(type, value) {
            if (type == "variable" || value == "void") {
                if (value == "keyof") {
                    cx.marked = "keyword"
                    return cont(typeexpr)
                } else {
                    cx.marked = "type"
                    return cont(afterType)
                }
            }
            if (type == "string" || type == "number" || type == "atom") return cont(afterType);
            if (type == "[") return cont(pushlex("]"), commasep(typeexpr, "]", ","), poplex, afterType)
            if (type == "{") return cont(pushlex("}"), commasep(typeprop, "}", ",;"), poplex, afterType)
            if (type == "(") return cont(commasep(typearg, ")"), maybeReturnType)
        }

        function maybeReturnType(type) {
            if (type == "=>") return cont(typeexpr)
        }

        function typeprop(type, value) {
            if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property"
                return cont(typeprop)
            } else if (value == "?") {
                return cont(typeprop)
            } else if (type == ":") {
                return cont(typeexpr)
            } else if (type == "[") {
                return cont(expression, maybetype, expect("]"), typeprop)
            }
        }

        function typearg(type) {
            if (type == "variable") return cont(typearg)
            else if (type == ":") return cont(typeexpr)
        }

        function afterType(type, value) {
            if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
            if (value == "|" || type == ".") return cont(typeexpr)
            if (type == "[") return cont(expect("]"), afterType)
            if (value == "extends" || value == "implements") {
                cx.marked = "keyword";
                return cont(typeexpr)
            }
        }

        function maybeTypeArgs(_, value) {
            if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
        }

        function typeparam() {
            return pass(typeexpr, maybeTypeDefault)
        }

        function maybeTypeDefault(_, value) {
            if (value == "=") return cont(typeexpr)
        }

        function vardef() {
            return pass(pattern, maybetype, maybeAssign, vardefCont);
        }

        function pattern(type, value) {
            if (isTS && isModifier(value)) {
                cx.marked = "keyword";
                return cont(pattern)
            }
            if (type == "variable") {
                register(value);
                return cont();
            }
            if (type == "spread") return cont(pattern);
            if (type == "[") return contCommasep(pattern, "]");
            if (type == "{") return contCommasep(proppattern, "}");
        }

        function proppattern(type, value) {
            if (type == "variable" && !cx.stream.match(/^\s*:/, false)) {
                register(value);
                return cont(maybeAssign);
            }
            if (type == "variable") cx.marked = "property";
            if (type == "spread") return cont(pattern);
            if (type == "}") return pass();
            return cont(expect(":"), pattern, maybeAssign);
        }

        function maybeAssign(_type, value) {
            if (value == "=") return cont(expressionNoComma);
        }

        function vardefCont(type) {
            if (type == ",") return cont(vardef);
        }

        function maybeelse(type, value) {
            if (type == "keyword b" && value == "else") return cont(pushlex("form", "else"), statement, poplex);
        }

        function forspec(type) {
            if (type == "(") return cont(pushlex(")"), forspec1, expect(")"), poplex);
        }

        function forspec1(type) {
            if (type == "var") return cont(vardef, expect(";"), forspec2);
            if (type == ";") return cont(forspec2);
            if (type == "variable") return cont(formaybeinof);
            return pass(expression, expect(";"), forspec2);
        }

        function formaybeinof(_type, value) {
            if (value == "in" || value == "of") {
                cx.marked = "keyword";
                return cont(expression);
            }
            return cont(maybeoperatorComma, forspec2);
        }

        function forspec2(type, value) {
            if (type == ";") return cont(forspec3);
            if (value == "in" || value == "of") {
                cx.marked = "keyword";
                return cont(expression);
            }
            return pass(expression, expect(";"), forspec3);
        }

        function forspec3(type) {
            if (type != ")") cont(expression);
        }

        function functiondef(type, value) {
            if (value == "*") {
                cx.marked = "keyword";
                return cont(functiondef);
            }
            if (type == "variable") {
                register(value);
                return cont(functiondef);
            }
            if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, mayberettype, statement, popcontext);
            if (isTS && value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, functiondef)
        }

        function funarg(type, value) {
            if (value == "@") cont(expression, funarg)
            if (type == "spread") return cont(funarg);
            if (isTS && isModifier(value)) {
                cx.marked = "keyword";
                return cont(funarg);
            }
            return pass(pattern, maybetype, maybeAssign);
        }

        function classExpression(type, value) {
            // Class expressions may have an optional name.
            if (type == "variable") return className(type, value);
            return classNameAfter(type, value);
        }

        function className(type, value) {
            if (type == "variable") {
                register(value);
                return cont(classNameAfter);
            }
        }

        function classNameAfter(type, value) {
            if (value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, classNameAfter)
            if (value == "extends" || value == "implements" || (isTS && type == ","))
                return cont(isTS ? typeexpr : expression, classNameAfter);
            if (type == "{") return cont(pushlex("}"), classBody, poplex);
        }

        function classBody(type, value) {
            if (type == "async" ||
                (type == "variable" &&
                    (value == "static" || value == "get" || value == "set" || (isTS && isModifier(value))) &&
                    cx.stream.match(/^\s+[\w$\xa1-\uffff]/, false))) {
                cx.marked = "keyword";
                return cont(classBody);
            }
            if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property";
                return cont(isTS ? classfield : functiondef, classBody);
            }
            if (type == "[")
                return cont(expression, maybetype, expect("]"), isTS ? classfield : functiondef, classBody)
            if (value == "*") {
                cx.marked = "keyword";
                return cont(classBody);
            }
            if (type == ";") return cont(classBody);
            if (type == "}") return cont();
            if (value == "@") return cont(expression, classBody)
        }

        function classfield(type, value) {
            if (value == "?") return cont(classfield)
            if (type == ":") return cont(typeexpr, maybeAssign)
            if (value == "=") return cont(expressionNoComma)
            return pass(functiondef)
        }

        function afterExport(type, value) {
            if (value == "*") {
                cx.marked = "keyword";
                return cont(maybeFrom, expect(";"));
            }
            if (value == "default") {
                cx.marked = "keyword";
                return cont(expression, expect(";"));
            }
            if (type == "{") return cont(commasep(exportField, "}"), maybeFrom, expect(";"));
            return pass(statement);
        }

        function exportField(type, value) {
            if (value == "as") {
                cx.marked = "keyword";
                return cont(expect("variable"));
            }
            if (type == "variable") return pass(expressionNoComma, exportField);
        }

        function afterImport(type) {
            if (type == "string") return cont();
            return pass(importSpec, maybeMoreImports, maybeFrom);
        }

        function importSpec(type, value) {
            if (type == "{") return contCommasep(importSpec, "}");
            if (type == "variable") register(value);
            if (value == "*") cx.marked = "keyword";
            return cont(maybeAs);
        }

        function maybeMoreImports(type) {
            if (type == ",") return cont(importSpec, maybeMoreImports)
        }

        function maybeAs(_type, value) {
            if (value == "as") {
                cx.marked = "keyword";
                return cont(importSpec);
            }
        }

        function maybeFrom(_type, value) {
            if (value == "from") {
                cx.marked = "keyword";
                return cont(expression);
            }
        }

        function arrayLiteral(type) {
            if (type == "]") return cont();
            return pass(commasep(expressionNoComma, "]"));
        }

        function isContinuedStatement(state, textAfter) {
            return state.lastType == "operator" || state.lastType == "," ||
                isOperatorChar.test(textAfter.charAt(0)) ||
                /[,.]/.test(textAfter.charAt(0));
        }

        function expressionAllowed(stream, state, backUp) {
            return state.tokenize == tokenBase &&
                /^(?:operator|sof|keyword [bcd]|case|new|export|default|spread|[\[{}\(,;:]|=>)$/.test(state.lastType) ||
                (state.lastType == "quasi" && /\{\s*$/.test(stream.string.slice(0, stream.pos - (backUp || 0))))
        }

        // Interface

        return {
            startState: function (basecolumn) {
                var state = {
                    tokenize: tokenBase,
                    lastType: "sof",
                    cc: [],
                    lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
                    localVars: parserConfig.localVars,
                    context: parserConfig.localVars && {vars: parserConfig.localVars},
                    indented: basecolumn || 0
                };
                if (parserConfig.globalVars && typeof parserConfig.globalVars == "object")
                    state.globalVars = parserConfig.globalVars;
                return state;
            },

            token: function (stream, state) {
                if (stream.sol()) {
                    if (!state.lexical.hasOwnProperty("align"))
                        state.lexical.align = false;
                    state.indented = stream.indentation();
                    findFatArrow(stream, state);
                }
                if (state.tokenize != tokenComment && stream.eatSpace()) return null;
                var style = state.tokenize(stream, state);
                if (type == "comment") return style;
                state.lastType = type == "operator" && (content == "++" || content == "--") ? "incdec" : type;
                return parseJS(state, style, type, content, stream);
            },

            indent: function (state, textAfter) {
                if (state.tokenize == tokenComment) return CodeMirror.Pass;
                if (state.tokenize != tokenBase) return 0;
                var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical, top
                // Kludge to prevent 'maybelse' from blocking lexical scope pops
                if (!/^\s*else\b/.test(textAfter)) for (var i = state.cc.length - 1; i >= 0; --i) {
                    var c = state.cc[i];
                    if (c == poplex) lexical = lexical.prev;
                    else if (c != maybeelse) break;
                }
                while ((lexical.type == "stat" || lexical.type == "form") &&
                (firstChar == "}" || ((top = state.cc[state.cc.length - 1]) &&
                    (top == maybeoperatorComma || top == maybeoperatorNoComma) &&
                    !/^[,\.=+\-*:?[\(]/.test(textAfter))))
                    lexical = lexical.prev;
                if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat")
                    lexical = lexical.prev;
                var type = lexical.type, closing = firstChar == type;

                if (type == "vardef") return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? lexical.info + 1 : 0);
                else if (type == "form" && firstChar == "{") return lexical.indented;
                else if (type == "form") return lexical.indented + indentUnit;
                else if (type == "stat")
                    return lexical.indented + (isContinuedStatement(state, textAfter) ? statementIndent || indentUnit : 0);
                else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false)
                    return lexical.indented + (/^(?:case|default)\b/.test(textAfter) ? indentUnit : 2 * indentUnit);
                else if (lexical.align) return lexical.column + (closing ? 0 : 1);
                else return lexical.indented + (closing ? 0 : indentUnit);
            },

            electricInput: /^\s*(?:case .*?:|default:|\{|\})$/,
            blockCommentStart: jsonMode ? null : "/*",
            blockCommentEnd: jsonMode ? null : "*/",
            blockCommentContinue: jsonMode ? null : " * ",
            lineComment: jsonMode ? null : "//",
            fold: "brace",
            closeBrackets: "()[]{}<>''\"\"``",

            helperType: jsonMode ? "json" : "javascript",
            jsonldMode: jsonldMode,
            jsonMode: jsonMode,

            expressionAllowed: expressionAllowed,

            skipExpression: function (state) {
                var top = state.cc[state.cc.length - 1]
                if (top == expression || top == expressionNoComma) state.cc.pop()
            }
        };
    });

    CodeMirror.registerHelper("wordChars", "javascript", /[\w$]/);

    CodeMirror.defineMIME("text/javascript", "javascript");
    CodeMirror.defineMIME("text/ecmascript", "javascript");
    CodeMirror.defineMIME("application/javascript", "javascript");
    CodeMirror.defineMIME("application/x-javascript", "javascript");
    CodeMirror.defineMIME("application/ecmascript", "javascript");
    CodeMirror.defineMIME("application/json", {name: "javascript", json: true});
    CodeMirror.defineMIME("application/x-json", {name: "javascript", json: true});
    CodeMirror.defineMIME("application/ld+json", {name: "javascript", jsonld: true});
    CodeMirror.defineMIME("text/typescript", {name: "javascript", typescript: true});
    CodeMirror.defineMIME("application/typescript", {name: "javascript", typescript: true});

});
